Gas burner and cap for supplying secondary air



April 1, 1952 D. E. Du PEROW 2,590,948

GAS BURNER AND CAP FOR SUPPLYING SECONDARY AIR Filed Aug. 3, 1950 wry/1mm W IN V EN TOR.

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Patented Apr. 1, 1952 rear ()FFICE GAS BURNER AND CAP FOR SUPPLYING SECONDARY AIR Donald E. Du Perow, St. Clair Shores, Mich, as-

signor to Lincoln Brass Works, Inc, Detroit, Mich, a corporation of Michigan Application AugustB, 1950, Serial No. 177,513

This invention relates to a gas burner and it has to do particularly with a gas burner of the type used in gas ranges.

The objects of the invention include the provision of a gas burner where the top portions are conveniently comprised of formed or stamped Fig. l is a view largely in cross section, illustrating a burner constructed in accordance with the invention, and showing the burner body and the parts which constitute the top.

Fig. 2 is a plan View of one of the parts which provides the ports.

Fig. 3 is an enlarged view showing the peripheral edge of the member illustrated in Fig. 2 and illustrating the ports formed thereby.

Fig. 4 is a sectional view illustrating the cap ring.

First, referring to Fig. 1, it will be noted that the body of the burner, which is generally illustrated at i, is formed or a fairly heavy construction and it may be of cast iron. It is fashioned as at 2 to receive a fuel supply pipe or mixing tube 3, and the fuel flows into an annular gas passageway t3 defined by an outer wall i and an inner wall 8.

Within the area defined by the inner wall 8 is a passage ii] for secondary air, this passage opening to the atmosphere at the lower portion of the burner. Means are provided for attaching the cap structure to the body and such a means is illustrated as in the form of a lug Ii which is screw threaded for receiving a screw l2.

The port forming ring, generally illustrated at 2B, is formed of relatively thin sheet metal and it has an inner flange 2! which generally centralizes the port ring and it has a part 22 for seating on the upper face of the wall 8. This port ring extends across the gas passage 6 and the outer peripheral portion is fashioned to provide a series of ports. As shown in Fig. 3, the outer peripheral portion is of corrugated or undulating form, the outer portion being generally 1 Claim. (Cl. 158-116) illustrated at 2%. As illustrated in Fig. 3, each corrugation is formed with a crest 25 while a relatively fiat base section 25 constitutes, in effect, the opposite crest. This port ring is to be placed on the burner body as illustrated in Fig. 1 with the crest portions 26 resting upon the upper surface of wall 7. The openings 23 constitute ports which open into the gas passageway E}. The lower portion of these ports are closed by the upper surface 0:" the wall 7. There is a cap member, generally illustrated at 38, which is to be placed over the port ring as shown in Fig. 1, and it has an outer peripheral portion 3i for seating on the crests 25. The central portion may be fashioned with a depression 32 and it has an opening 33 therein for the passage of the screw 12. This cap is also preferably formed of fashioned or stamped sheet metal and its upper exposed surface is advantageously polished or plated with a bright metal.

When the cap is secured in position by the screw 12 it clamps the port ring in position and the outer peripheral edge seats tightly on the corrugated outer peripheral edge of the port ring. The cap, however, is spaced from the port ring to provide a chamber 35 which communicates through the hollow central part of the port ring with the air passage Iii. The openings or spaces 36 constitute ports which are alternately disposed relative to the ports 28 and which communicate with the chamber 35 and are closed at their upper portion by the peripheral edge of the cap.

In use, it is to be appreciated that the gas,

which may be natural gas, manufactured gas,

or a mixture thereof, is mixed with air in the usual manner and that this combustible mixture flows into the gas passage 6 and out through the ports 28 to support combustion. With this arrangement there is an annular series of flames issuing from the ports 28 when the burner is ignited. The flames are separated by the ports 36. Secondary air is air which has access to the flame to aid in the combustion and some secondary air is obtained from the ambient atmosphere around the burner. Other secondary air flows through the passage iii into the chamber 35 and out through the ports 35. Thus there is a stream of secondary air between each flame. This not only aids combustion of the flame but serves admirably to maintain the several flames visibly separated and distinct.

I claim:

A gas burner comprising, a body having innor and outer annular walls defining a gas chamher therebetween, and the inner wall defining an opening for secondary air, said walls having top surfaces, :3. port ring having an inner fiat part seating on the top surface of the inner wall and having an outer peripheral part of corrugated form with the corrugations running substantially radially, the lower crests of the corrugated form seating on the top surface of the outer wall with the grooves on the underside of the port ring constituting ports communicating to with the gas chamber for the flow of gas through the ports to support gas flames, a cap member having an outer peripheral part seating on the upper crests of the corrugated form, means se- 7 curing the cap to the body, the central part of 15 the cap closing the said opening for secondary air, said cap being spaced from the port ring to provide a chamber above the port ring, the port ring having a central opening therein which registers with the opening defined by the inner wall of the body so that secondary air may flow from the opening in the body into said chamber. the grooves of the corrugated form on the upper side of the port ring constituting ports for the flow of secondary air therethrough to be discharged between the ports on the underside of the port ring.

DONALD E. DU PEROW.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,109,498 Marvin, et a1 Mar. 1, 1938 2,494,243 Houlis Jan. 10, 1950 

